SBS-H2 Users Manual, Rev. 07-17-TNEMH2 Page 5 July 2017
1.0 Overview
Batteries on charge emit hydrogen gas as part of the chemical reaction of recharge.
Concentrations of 4.1% to 75% H
2
mixed with air can be explosive. Sparks or hot surfaces can
ignite hydrogen gas.
The SBS-H2 hydrogen detector acts as a monitor and provides a visual and audible alarm when
hydrogen is detected. The unit also has a 1% concentration relay that can trigger exhaust fan
operation and a 2% concentration relay that can trigger a building management/alarm system (via
SCADA/Modbus) before the gas reaches the lower explosive limit (LEL) of 4.1%.
2.0 Benefits
In addition to protecting employees and property, the detector may also reduce the following costs:
Energy Efficiencies
Instead of continuously running an exhaust fan to prevent hydrogen gas accumulation, use the
detector to activate a fan only if the gas concentration reaches 1%.
Insurance Savings
Installation of a detector in areas where batteries are charged may result in a premium reduction.
3.0 How it Works
Should the concentration of hydrogen gas in the air surrounding the sensor reach 1% by volume, the
“1% Warning” yellow LED will light up on the main control of the unit. In addition, the 1% internal relay
will energize and can be used to activate a remote exhaust fan.
Should the hydrogen gas concentration reach 2% by volume, the “2% Alarm” red LED will light up,
the strobe will flash and an audible alarm will sound. In addition, the 2% internal relay will energize
and can be used to activate a building management/alarm system (via SCADA/Modbus).
The SBS-H2 provides automatic operation, continuous detection, high sensitivity, stability and solid-
state reliability. The unit uses 120/240 Vac 50/60 Hz and/or 12 - 48 Vdc operating voltages.
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